"""Application configuration management."""

from functools import lru_cache
from typing import Literal

from pydantic import Field
from pydantic_settings import BaseSettings, SettingsConfigDict


class Settings(BaseSettings):
    """Application settings loaded from environment variables."""

    model_config = SettingsConfigDict(
        env_file=".env",
        env_file_encoding="utf-8",
        case_sensitive=False,
        extra="ignore",
    )

    # Application
    app_env: Literal["dev", "prod"] = "dev"
    app_host: str = "0.0.0.0"
    app_port: int = 8000

    # Database
    database_url: str = "sqlite+aiosqlite:///./app.db"

    # S3 Storage
    s3_endpoint_url: str | None = None
    s3_region: str = "us-east-1"
    s3_access_key_id: str
    s3_secret_access_key: str
    media_bucket: str = "itcloud-media"
    trash_bucket: str = "itcloud-trash"

    # Security
    jwt_secret: str
    jwt_algorithm: str = "HS256"
    jwt_access_ttl_seconds: int = 900
    jwt_refresh_ttl_seconds: int = 1209600

    # Upload limits
    max_upload_size_bytes: int = 3221225472  # 3GB
    signed_url_ttl_seconds: int = 600
    default_storage_quota_bytes: int = 3221225472  # 3GB per user

    # CORS
    cors_origins: str = "http://localhost:5173"

    @property
    def cors_origins_list(self) -> list[str]:
        """Parse CORS origins as a list."""
        return [origin.strip() for origin in self.cors_origins.split(",")]

    # Redis
    redis_url: str = "redis://localhost:6379/0"

    # Thumbnails
    thumbnail_max_size: int = 1024
    thumbnail_quality: int = 85


@lru_cache
def get_settings() -> Settings:
    """Get cached application settings."""
    return Settings()